Method and apparatus for indicating resources for uplink control channel in a mobile communication system

ABSTRACT

The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method of receiving uplink control information in a communication system. The method includes identifying a resource for receiving the uplink control information on a first uplink control channel from a terminal, transmitting first information associated with the resource to the terminal, transmitting second information associated with the resource to the terminal, and receiving the uplink control information on the uplink control channel based on the first information and the second information from the terminal.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is based on and claims priority under 35 U.S.C. §119(a) to Korean Patent Application Serial No. 10-2017-0056827, whichwas filed on May 4, 2017 in the Korean Intellectual Property Office, theentire disclosure of which is incorporated herein by reference.

BACKGROUND 1. Field

The disclosure relates, generally, to an electronic device, and moreparticularly, to an electronic device configured for indicating uplink(UL) control channel resources in a wireless cellular communicationsystem.

2. Description of the Related Art

To meet the demand for wireless data traffic having increased sincedeployment of 4G communication systems, efforts have been made todevelop an improved 5G or pre-5G communication system. Therefore, the 5Gor pre-5G communication system is also called a ‘Beyond 4G Network’ or a‘Post LTE System’. The 5G communication system is considered to beimplemented in higher frequency (mmWave) bands, e.g., 60 GHz bands, soas to accomplish higher data rates. To decrease propagation loss of theradio waves and increase the transmission distance, the beamforming,massive multiple-input multiple-output (MIMO), Full Dimensional MIMO(FD-MIMO), array antenna, an analog beam forming, large scale antennatechniques are discussed in 5G communication systems. In addition, in 5Gcommunication systems, development for system network improvement isunder way based on advanced small cells, cloud Radio Access Networks(RANs), ultra-dense networks, device-to-device (D2D) communication,wireless backhaul, moving network, cooperative communication,Coordinated Multi-Points (CoMP), reception-end interference cancellationand the like. In the 5G system, Hybrid FSK and QAM Modulation (FQAM) andsliding window superposition coding (SWSC) as an advanced codingmodulation (ACM), and filter bank multi carrier (FBMC), non-orthogonalmultiple access(NOMA), and sparse code multiple access (SCMA) as anadvanced access technology have been developed.

The Internet, which is a human centered connectivity network wherehumans generate and consume information, is now evolving to the Internetof Things (IoT) where distributed entities, such as things, exchange andprocess information without human intervention. The Internet ofEverything (IoE), which is a combination of the IoT technology and theBig Data processing technology through connection with a cloud server,has emerged. As technology elements, such as “sensing technology”,“wired/wireless communication and network infrastructure”, “serviceinterface technology”, and “Security technology” have been demanded forIoT implementation, a sensor network, a Machine-to-Machine (M2M)communication, Machine Type Communication (MTC), and so forth have beenrecently researched. Such an IoT environment may provide intelligentInternet technology services that create a new value to human life bycollecting and analyzing data generated among connected things. IoT maybe applied to a variety of fields including smart home, smart building,smart city, smart car or connected cars, smart grid, health care, smartappliances and advanced medical services through convergence andcombination between existing Information Technology (IT) and variousindustrial applications.

In line with this, various attempts have been made to apply 5Gcommunication systems to IoT networks. For example, technologies such asa sensor network, Machine Type Communication (MTC), andMachine-to-Machine (M2M) communication may be implemented bybeamforming, MIMO, and array antennas. Application of a cloud RadioAccess Network (RAN) as the above-described Big Data processingtechnology may also be considered to be as an example of convergencebetween the 5G technology and the IoT technology.

However, because the 5G communication system provides various slotformats, the number of UL orthogonal frequency division multiplexing(OFDM) symbols in one slot may vary.

SUMMARY

The disclosure has been made to address at least the disadvantagesdescribed above and to provide at least the advantages described below.

Accordingly, an aspect of the disclosure provides a method and apparatusthat indicate, when the number of UL OFDM symbols varies according to aslot format, a transmission interval (or, start symbol and end symbol)of the long physical UL control channel (PUCCH) suitable for the numberof UL OFDM symbols.

An aspect of the disclosure provides a method and apparatus thatindicate, when UL control channels such as long PUCCH, short PUCCH andsounding reference signal (SRS) coexist in one TTI or one slot, thetransmission interval (or, start symbol and end symbol) of the longPUCCH to avoid resource conflicts and maximize resource utilization.

In accordance with an aspect of the disclosure, there is provided amethod of receiving UL control information in a communication system.The method includes identifying a resource for receiving the UL controlinformation on a first UL control channel from a terminal, transmittingfirst information associated with the resource to the terminal,transmitting second information associated with the resource to theterminal, and receiving the UL control information on the UL controlchannel based on the first information and the second information fromthe terminal.

In accordance with an aspect of the disclosure, there is provided amethod of transmitting UL control information in a communication system.The method includes receiving, from a base station, first informationassociated with a resource for transmitting the UL control informationon a first UL control channel to the base station, receiving, to thebase station, second information associated with the resource,identifying the resource for the first UL control channel based on thefirst information and the second information, and transmitting, to thebase station, the UL control information on the first UL control channelon the identified resource.

In accordance with an aspect of the disclosure, there is provided a basestation for receiving UL control information in a communication system.The base station includes a transceiver and a processor coupled with thetransceiver and configured to identify a resource for receiving the ULcontrol information on a first UL control channel from a terminal,transmit first information associated with the resource to the terminal,transmit second information associated with the resource to theterminal, and receive the UL control information on the UL controlchannel based on the first information and the second information fromthe terminal.

In accordance with an aspect of the disclosure, there is provided aterminal for transmitting UL control information in a communicationsystem. The terminal includes a transceiver and at least one processorcoupled with the transceiver and configured to receive, from a basestation, first information associated with a resource for transmittingthe UL control information on a first UL control channel to the basestation, receive, from the base station, second information associatedwith the resource, identify the resource for the first UL controlchannel based on the first information and the second information, andtransmit, to the base station, the UL control information on the firstUL control channel on the identified resource.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features and advantages of certainembodiments of the disclosure will be more apparent from the followingdetailed description taken in conjunction with the accompanyingdrawings, in which:

FIG. 1 is a diagram of a time-frequency domain in a long-term evolution(LTE) system, in accordance with an embodiment;

FIG. 2 is a diagram of 5G services that are multiplexed and transmittedin a system, in accordance with an embodiment;

FIG. 3A is a diagram of a communication system, in accordance with anembodiment;

FIGS. 3B and 3C are flowcharts of a method of transmitting and receivingdata between a base station and a terminal in a 5G communication system,in accordance with an embodiment;

FIGS. 4A and 4B are diagrams of slot configurations, in accordance withan embodiment;

FIGS. 5A and 5B are flowcharts of a method of transmitting and receivingdata between a base station and a terminal in a 5G communication system,in accordance with an embodiment;

FIG. 6 is a diagram of a slot configuration, in accordance with anembodiment;

FIG. 7 is a diagram of a base station, in accordance with an embodiment;and

FIG. 8 is a diagram of a terminal station, in accordance with anembodiment.

DETAILED DESCRIPTION

Embodiments of the disclosure will be described herein below withreference to the accompanying drawings. However, the embodiments of thedisclosure are not limited to the specific embodiments and should beconstrued as including all modifications, changes, equivalent devicesand methods, and/or alternative embodiments of the present disclosure.In the description of the drawings, similar reference numerals are usedfor similar elements.

The terms “have,” “may have,” “include,” and “may include” as usedherein indicate the presence of corresponding features (for example,elements such as numerical values, functions, operations, or parts), anddo not preclude the presence of additional features.

The terms “A or B,” “at least one of A or/and B,” or “one or more of Aor/and B” as used herein include all possible combinations of itemsenumerated with them. For example, “A or B,” “at least one of A and B,”or “at least one of A or B” means (1) including at least one A, (2)including at least one B, or (3) including both at least one A and atleast one B.

The terms such as “first” and “second” as used herein may usecorresponding components regardless of importance or an order and areused to distinguish a component from another without limiting thecomponents. These terms may be used for the purpose of distinguishingone element from another element. For example, a first user device and asecond user device may indicate different user devices regardless of theorder or importance. For example, a first element may be referred to asa second element without departing from the scope the disclosure, andsimilarly, a second element may be referred to as a first element.

It will be understood that, when an element (for example, a firstelement) is “(operatively or communicatively) coupled with/to” or“connected to” another element (for example, a second element), theelement may be directly coupled with/to another element, and there maybe an intervening element (for example, a third element) between theelement and another element. To the contrary, it will be understoodthat, when an element (for example, a first element) is “directlycoupled with/to” or “directly connected to” another element (forexample, a second element), there is no intervening element (forexample, a third element) between the element and another element.

The expression “configured to (or set to)” as used herein may be usedinterchangeably with “suitable for,” “having the capacity to,” “designedto,” “ adapted to,” “made to,” or “capable of” according to a context.The term “configured to (set to)” does not necessarily mean“specifically designed to” in a hardware level. Instead, the expression“apparatus configured to . . . ” may mean that the apparatus is “capableof . . . ” along with other devices or parts in a certain context. Forexample, “a processor configured to (set to) perform A, B, and C” maymean a dedicated processor (e.g., an embedded processor) for performinga corresponding operation, or a generic-purpose processor (e.g., acentral processing unit (CPU) or an application processor (AP)) capableof performing a corresponding operation by executing one or moresoftware programs stored in a memory device.

The terms used in describing the various embodiments of the disclosureare for the purpose of describing particular embodiments and are notintended to limit the disclosure. As used herein, the singular forms areintended to include the plural forms as well, unless the context clearlyindicates otherwise. All of the terms used herein including technical orscientific terms have the same meanings as those generally understood byan ordinary skilled person in the related art unless they are definedotherwise. The terms defined in a generally used dictionary should beinterpreted as having the same or similar meanings as the contextualmeanings of the relevant technology and should not be interpreted ashaving ideal or exaggerated meanings unless they are clearly definedherein. According to circumstances, even the terms defined in thisdisclosure should not be interpreted as excluding the embodiments of thedisclosure.

The term “module” as used herein may, for example, mean a unit includingone of hardware, software, and firmware or a combination of two or moreof them. The term “module” may be interchangeably used with, forexample, the term “unit”, “logic”, “logical block”, “component”, or“circuit”. The “module” may be a minimum unit of an integrated componentelement or a part thereof. The “module” may be a minimum unit forperforming one or more functions or a part thereof. The “module” may bemechanically or electronically implemented. For example, the “module”according to the disclosure may include at least one of anapplication-specific integrated circuit (ASIC) chip, afield-programmable gate array (FPGA), and a programmable-logic devicefor performing operations which has been known or are to be developedhereinafter.

An electronic device according to the disclosure may include at leastone of, for example, a smart phone, a tablet personal computer (PC), amobile phone, a video phone, an electronic book reader (e-book reader),a desktop PC, a laptop PC, a netbook computer, a workstation, a server,a personal digital assistant (PDA), a portable multimedia player (PMP),a MPEG-1 audio layer-3 (MP3) player, a mobile medical device, a camera,and a wearable device. The wearable device may include at least one ofan accessory type (e.g., a watch, a ring, a bracelet, an anklet, anecklace, a glasses, a contact lens, or a head-mounted device (HMD)), afabric or clothing integrated type (e.g., an electronic clothing), abody-mounted type (e.g., a skin pad, or tattoo), and a bio-implantabletype (e.g., an implantable circuit).

The electronic device may be a home appliance. The home appliance mayinclude at least one of, for example, a television, a digital video disk(DVD) player, an audio, a refrigerator, an air conditioner, a vacuumcleaner, an oven, a microwave oven, a washing machine, an air cleaner, aset-top box, a home automation control panel, a security control panel,a TV box (e.g., Samsung HomeSync™, Apple TV™, or Google TV™), a gameconsole (e.g., Xbox™ and PlayStation™), an electronic dictionary, anelectronic key, a camcorder, and an electronic photo frame.

The electronic device may include at least one of various medicaldevices (e.g., various portable medical measuring devices (a bloodglucose monitoring device, a heart rate monitoring device, a bloodpressure measuring device, a body temperature measuring device, etc.), amagnetic resonance angiography (MRA), a magnetic resonance imaging(MRI), a computed tomography (CT) machine, and an ultrasonic machine), anavigation device, a global positioning system (GPS) receiver, an eventdata recorder (EDR), a flight data recorder (FDR), a vehicleinfotainment device, an electronic device for a ship (e.g., a navigationdevice for a ship, and a gyro-compass), avionics, security devices, anautomotive head unit, a robot for home or industry, an automatic tellermachine (ATM) in banks, point of sales (POS) devices in a shop, or anInternet of things device (IoT) (e.g., a light bulb, various sensors,electric or gas meter, a sprinkler device, a fire alarm, a thermostat, astreetlamp, a toaster, a sporting goods, a hot water tank, a heater, aboiler, etc.).

The electronic device may include at least one of a part of furniture ora building/structure, an electronic board, an electronic signaturereceiving device, a projector, and various kinds of measuringinstruments (e.g., a water meter, an electric meter, a gas meter, and aradio wave meter). The electronic device may be a combination of one ormore of the aforementioned various devices. The electronic device mayalso be a flexible device. Further, the electronic device is not limitedto the aforementioned devices, and may include an electronic deviceaccording to the development of new technology.

Hereinafter, an electronic device will be described with reference tothe accompanying drawings. In the disclosure, the term “user” mayindicate a person using an electronic device or a device (e.g., anartificial intelligence electronic device) using an electronic device.

The following description of embodiments is focused on OFDM-basedwireless communication systems and the 3GPP evolved universal mobiletelecommunications system (UMTS) terrestrial radio access (EUTRA)standards. However, those skilled in the art will appreciate that thesubject matter disclosed herein is applicable to other communicationsystems having similar technical backgrounds and channel configurationswithout significant modifications departing from the scope of thedisclosure.

The 3rd generation partnership project (3GPP) has been working tostandardize specifications for the long term evolution (LTE) system as anext generation mobile communication system. The LTE system aims torealize high-speed packet based communication supporting a data rate ofabout 100 Mbps.

The LTE system employs hybrid automatic repeat request (HARQ) toretransmit data at the physical layer when a decoding error has occurredin the initial transmission. HARQ is a scheme that enables the receiverhaving failed in decoding data to transmit information (negativeacknowledgement (NACK)) indicating the decoding failure to thetransmitter so that the transmitter can retransmit the correspondingdata at the physical layer. The receiver may combine the retransmitteddata with the previously received data for which decoding has failed,increasing data reception performance. When the data is correctlydecoded, the receiver may transmit information (acknowledgement (ACK))indicating successful decoding to the transmitter so that thetransmitter can transmit new data.

FIG. 1 is a diagram of a time-frequency domain serving as radioresources to transmit data or control channels in the downlink (DL) ofthe LTE system, according to an embodiment.

In FIG. 1, the horizontal axis denotes the time domain and the verticalaxis denotes the frequency domain. In the time domain, the minimum unitfor transmission is OFDMA symbols, N_(symb) OFDMA symbols 102 constituteone slot 106, and two slots constitute one subframe 105. The length of aslot is 0.5 ms and the length of a subframe is 1.0 ms. The radio frame(or frame) 114 is a time domain unit composed of 10 subframes. In thefrequency domain, the minimum unit for transmission is subcarriers, andthe total system transmission bandwidth is composed of N_(BW)subcarriers 104.

The basic unit of resources in the time-frequency domain is a resourceelement (RE) 112. The RE may be represented by an OFDM symbol index anda subcarrier index. A resource block (RB) (or physical resource block(PRB)) 108 is defined by N_(symb) consecutive OFDM symbols 102 in thetime domain and NRB consecutive subcarriers 110 in the frequency domain.Hence, one RB 108 is composed of N_(symb)×N_(RB) REs 112. The minimumunit for data transmission is an RB. Normally, in the LTE system,N_(symb) is set to 7 and N_(RB) is set to 12, and the number ofsubcarriers NBW is proportional to the bandwidth of the systemtransmission band. The data rate may increase in proportion to thenumber of resource blocks scheduled for the terminal.

The LTE system defines and operates six transmission bandwidths. When afrequency-division duplex (FDD) system where DL and UL frequencies areseparately used, the DL transmission bandwidth may differ from the ULtransmission bandwidth. The channel bandwidth denotes a radio frequency(RF) bandwidth corresponding to the system transmission bandwidth. Table1 illustrates a correspondence between the system transmission bandwidthand the channel bandwidth defined in the LTE system. For example, thetransmission bandwidth of an LTE system having a channel bandwidth of10MHz is composed of 50 resource blocks.

TABLE 1 Channel bandwidth BW_(channel) MHz 1.4 3 5 10 15 20 Transmissionbandwidth 6 15 25 50 75 100 configuration

In a subframe, N initial OFDM symbols are used to transmit DL controlinformation. In general, N={1, 2, 3}. The value of N varies for eachsubframe according to the amount of control information to betransmitted at the current subframe. The control information may includea control channel transmission interval indicator indicating the numberof OFDM symbols carrying control information, scheduling information forDL data or UL data, and HARQ ACK/NACK signals.

In an LTE system, scheduling information for DL data or UL data istransmitted by the base station to the terminal through DL controlinformation (DCI). The UL refers to a radio link through which theterminal transmits data or a control signal to the base station, and theDL (DL) refers to a radio link through which the base station transmitsdata or a control signal to the terminal. Various DCI formats aredefined. The DCI format to be used may be determined according tovarious parameters related to scheduling information for UL data (ULgrant), scheduling information for DL data (DL grant), compact DCI witha small size, spatial multiplexing using multiple antennas, and powercontrol DCI.

For example, DCI format 1 for scheduling information of DL grant isconfigured to include at least the following pieces of controlinformation.

Resource allocation type 0/1 flag: this indicates whether the resourceallocation scheme is of type 0 or type 1. Type 0 indicates resourceallocation in units of resource block groups (RBG) by use of a bitmap.In the LTE system, the basic scheduling unit is an RB represented as atime-frequency domain resource. An RBG including multiple RBs is thebasic scheduling unit for type 0. Type 1 indicates allocation of aspecific RB in one RBG.

RB assignment: this indicates an RB allocated for data transmission. Theresource represented by RB assignment is determined according to thesystem bandwidth and resource allocation scheme.

Modulation and coding scheme (MCS): this indicates the modulation schemeapplied for data transmission and the transport block size (TBS) fordata to be sent.

HARQ process number: this indicates the process number of thecorresponding HARQ process.

New data indicator: this indicates either initial transmission orretransmission for HARQ.

Redundancy version: this indicates the redundancy version for HARQ.

TPC (transmit power control) command for PUCCH: this indicates a TPCcommand for the PUCCH being an UL control channel.

The DCI is channel coded, modulated, and transmitted through thephysical DL control channel (PDCCH) or EPDCCH (enhanced PDCCH).

In general, the DCI is channel coded for each terminal, and transmittedvia an independent PDCCH. In the time domain, the PDCCH is mapped andtransmitted during the control channel transmission interval. In thefrequency domain, the mapping position of the PDCCH is determined by theidentifier (ID) of each terminal and the PDCCH is dispersed across theoverall system transmission bandwidth.

DL data is transmitted via the physical DL shared channel (PDSCH)serving as a physical DL channel. The PDSCH is transmitted after thecontrol channel transmission interval. Scheduling information for thePDSCH such as mapping positions in the frequency domain or themodulation scheme is indicated by the DCI transmitted on the PDCCH.

The base station uses the 5-bit MCS field of control informationconstituting the DCI to indicate (or UE) the modulation scheme appliedto the PDSCH (to be transmitted to UE) and the size of data to betransmitted (TBS) to the terminal. The TBS indicates the size of a TBbefore channel coding is applied for error correction.

Modulation schemes supported by the LTE system include QPSK (quadraturephase shift keying), 16QAM, and 64QAM, whose modulation order (Qm) is 2,4 and 6, respectively. That is, it is possible to transmit 2, 4, and 6bits per symbol by using QPSK, 16QAM, and 64QAM, respectively.

In 3GPP LTE Release 10, a bandwidth extension technique has been adoptedto support higher data transmission rates compared to LTE Release 8. Theabove technique called bandwidth extension or carrier aggregation (CA)can extend the bandwidth and increase the amount of data transmission inproportion to the extended bandwidth compared with the LTE Release 8terminal that transmits data in one band. Each of the bands is referredto as a component carrier (CC), and the LTE Release 8 terminal isspecified to have one CC for each of the DL and the UL. The DL CC andthe UL CC that are associated with each other via SIB-2 are referred toas a cell. The SIB-2 association between the DL component carrier andthe UL component carrier is transmitted through a system signal orhigher signal (or, higher layer signal). A terminal supporting CA canreceive DL data and transmit UL data through a plurality of servingcells.

In LTE Release 10, when it is difficult for the base station to transmitthe PDCCH via a given serving cell to a specific terminal, the basestation may transmit the PDCCH via a different serving cell and set thecarrier indicator field (CIF) to indicate that the PDCCH indicates thePDSCH or physical UL shared channel (PUSCH) of the different servingcell. The CIF may be set for a terminal supporting CA.

The CIF may indicate another serving cell by adding 3 bits to PDCCHinformation transmitted in a given serving cell. The CIF is includedonly when cross carrier scheduling is performed, and cross carrierscheduling is not performed when the CIF is not included. When the CIFis included in the DL assignment, it indicates the serving cell throughwhich the PDSCH scheduled by the DL assignment is to be transmitted, andwhen the CIF is included in the UL grant, it indicates the serving cellthrough which the PUSCH scheduled by the UL grant is to be transmitted.

As described above, in LTE Release 10, CA is defined as a bandwidthextension technique, and a plurality of serving cells can be configuredfor the terminal. For data scheduling of the base station, the terminalperiodically or non-periodically transmits channel information on theplurality of serving cells to the base station. The base stationschedules data and transmits the data for each carrier, and the terminaltransmits A/N feedback on the data received for each carrier. In LTERelease 10, the terminal can transmit A/N feedback of up to 21 bits, andwhen transmission of A/N feedback and transmission of channelinformation overlap in one subframe, the terminal may transmit the A/Nfeedback and discard the channel information. In LTE Release 11, bymultiplexing one cell channel information together with A/N feedback,A/N feedback and one cell channel information (up to 22 bits) can betransmitted via PUCCH format 3 in the transmission resources of PUCCHformat 3.

In LTE Release 13, it is possible to configure up to 32 serving cells byusing not only the licensed band but also the unlicensed band.Considering that the number of licensed bands such as LTE systemfrequency is limited, a technology called LAA (licensed assisted access)has been introduced to provide LTE services in the unlicensed band suchas the 5 GHz band. In LAA, LTE carrier aggregation is applied so that anLTE cell in the licensed band may operate as the primary cell (P cell)and an LAA cell in the unlicensed band may operate as a secondary cell(S cell). Hence, as in the LTE system, the feedback generated in the LAAcell being an S cell should be transmitted only via the P cell, and theDL subframe and the UL subframe can be freely configured in the LAAcell. Unless otherwise stated herein, LTE refers to all the evolvedtechnologies of LTE such as LTE-A (LTE-advanced) and LAA.

As a post-LTE communication system, the fifth generation wirelesscellular communication system (5G or NR) should be able to supportservices satisfying various requirements in consideration of variousrequirements of users and service providers. The 5G communication systemaims to support various 5G type services such as enhanced mobilebroadband (eMBB), massive machine type communication (mMTC), and ultrareliable and low latency communications (URLLC). These 5G type servicesmay correspond to satisfying some of the requirements including amaximum transmission rate of 20 Gbps for the terminal, a maximum speedof 500 km/h for the terminal, a maximum latency of 0.5 ms, and aterminal density of 1,000,000 terminals/ km².

For example, to provide the eMBB service in the 5G communication system,the base station should be able to provide the terminal with a maximumtransmission rate of 20 Gbps in the DL and a maximum transmission rateof 10 Gbps in the UL. At the same time, the average transmission rate ofthe terminal must also be increased for actual user experience. To meetsuch requirements, there is a need for improved transmission andreception techniques including advanced MIMO.

At the same time, mMTC is considered to support application servicessuch as IoT in the 5G communication system. In mMTC, to efficientlyprovide IoT services, it is necessary to support a very large number ofterminals in a cell, extend the coverage of the terminal, lengthen thebattery time, and reduce the cost of the terminal. The IoT must be ableto support a very large number of terminals (e.g., 1,000,000terminals/km²) in a cell to provide a communication service to sensorsand components attached to various devices. In addition, due to thenature of the service, mMTC is more likely to cover shadow areas such asthe basement of a building and a region that a cell cannot cover, thusrequiring a coverage wider than that provided by eMBB. Low-costterminals are likely to be used in mMTC, and a very long batterylifetime is required because it is difficult to frequently replace thebattery of a terminal.

URLLC, as cellular-based wireless communication for a specific purpose,is a service usable for remote control of robots or machinery,industrial automation, unmanned aerial vehicles, remote health control,and emergency notification, and should enable ultra-reliable andlow-latency communication. For example, a URLLC service may have tosupport both a maximum delay time of less than 0.5 ms and a packet errorrate of 10⁻⁵ or less as a requirement. Hence, for the URLLC, the TTIshould be shorter than that of the 5 G eMBB service, and resourcesshould be allocated in a wide frequency band.

The services considered in the 5G wireless cellular communication systemdescribed above should be provided as a single framework. That is, forefficient resource management and control, it is desirable that theindividual services be integrated, controlled and transmitted via onesystem rather than being operated independently.

FIG. 2 is a diagram of 5G services that are multiplexed and transmittedin a system, in accordance with an embodiment.

In FIG. 2, a frequency-time resource 200 used in the 5G communicationsystem may be composed of the frequency axis 210 and the time axis 220.The 5G communication system operates eMBB 240, mMTC 250, and URLLC 260within one framework. As a service that can be additionally consideredin the 5G communication system, there is enhanced mobilebroadcast/multicast service (eMBMS) 270 for providing a cellular basedbroadcasting service. Those services considered in the 5G communicationsystem, such as eMBB 240, mMTC 250, URLLC 260 and eMBMS 270, may bemultiplexed and transmitted through time division multiplexing (TDM) orfrequency division multiplexing (FDM) within a single system frequencybandwidth operated in the 5G communication system. Spatial divisionmultiplexing may also be applied.

For eMBB 240, to provide the increased data transmission rate describedbefore, it may prove advantageous to occupy a maximum frequencybandwidth at a specific time for transmission. Hence, the eMBB service240 may be time division multiplexed (TDMed) with other services withinthe system transmission bandwidth 200 for transmission. It is alsopreferable that the eMBB service 240 is frequency division multiplexed(FDMed) with other services within the system transmission bandwidth 200for transmission depending on the needs of other services.

For mMTC 250, unlike other services, an increased transmission intervalis required to secure wide coverage, and the coverage can be secured byrepetitively transmitting the same packet within the transmissioninterval. At the same time, to reduce the complexity and cost of theterminal, the transmission bandwidth available to the terminal islimited. Considering these requirements, it may prove advantageous thatmMTC 250 is FDMed with other services within the system transmissionbandwidth 200 for transmission.

For URLLC 260, to satisfy the ultra-low latency requirement, it mayprove advantageous to have a shorter TTI compared with other services.At the same time, as a low coding rate is needed to satisfy theultra-reliability requirement, a wide bandwidth in the frequency domainmay be used. Considering these requirements, the URLLC 260 may be TDMedwith other services within the system transmission bandwidth 200 fortransmission.

The individual services described above may have different transmissionand reception techniques and parameters to meet their requirements. Forexample, each service may have a different numerology depending on itsservice requirement. The numerology may include information regarding acyclic prefix (CP) length, a subcarrier spacing, a length of an OFDMsymbol, and the TTI in a communication system based on OFDM or OFDMA.

As an example of different numerologies between the above services,eMBMS 270 may have a longer CP length compared to other services. Sincethe eMBMS transmits broadcast-based higher layer traffic, the same datacan be transmitted in all cells. If signals of plural cells arrive atthe terminal within a delay of CP length, as the terminal can receiveand decode all of these signals, a single frequency network (SFN) gaincan be obtained. Hence, a terminal located at the cell boundary canreceive broadcast information without coverage restriction. However, ifa longer CP length is used for the eMBMS in the 5G communication system,the CP overhead may cause waste; this may require the use of a longerOFDM symbol length and a narrower subcarrier spacing in comparison toother services.

As another example of different numerologies between the services in the5G communication system, since URLLC requires a shorter TTI compared toother services, a shorter OFDM symbol length and a wider subcarrierspacing may be used.

In the 5G communication system, one TTI may be defined as one slot andmay be composed of 14 OFDM symbols or 7 OFDM symbols. When a subcarrierspacing of 15 KHz, one slot will have a length of 1 ms or 0.5ms. Foremergency transmission or unlicensed band transmission in the 5Gcommunication system, one TTI may be defined as one mini-slot orsub-slot, and one mini-slot may have one OFDM symbol to K-1 OFDM symbols(K can equal the number of OFDM symbols in the slot). If the length ofone slot is 14 OFDM symbols, the length of a mini-slot can be determinedfrom 1 to 13 OFDM symbols. The length of the slot or mini-slot may bespecified by the standard or may be indicated to the terminal via ahigher layer signal or system information.

The slot or mini-slot can be defined to have various transmissionformats, and can be classified in accordance with the following:

DL only slot or full DL slot; this slot includes a DL section only andsupports DL transmission only;

DL centric slot; this slot is composed of a DL section, a guard period(GP), and an UL section, and the number of OFDM symbols in the DLsection is larger than that in the UL section;

UL centric slot; this slot is composed of a DL section, a GP, and an ULsection, and the number of OFDM symbols in the downlink section issmaller than that in the UL section; and

UL only slot or full UL slot; this slot includes an UL section only andsupports UL transmission only.

In the above description, while only the slot format is classified, themini-slot can be classified in the same manner. That is, the mini-slotscan be classified into DL only mini-slot or full DL mini-slot, DLcentric mini-slot, UL centric mini-slot, UL only mini-slot or full ULmini-slot.

The transmission interval (or transmission start symbol and transmissionend symbol) of the UL control channel may be changed according to theformat of the slot or mini-slot. Also, it may be to consider a casewhere the UL control channels are multiplexed within one slot. Forexample, the UL control channel having a short transmission interval forminimizing the transmission delay (short PUCCH) and the UL controlchannel having a long transmission interval (long PUCCH) may coexist inone slot, and an uplink sounding signal such as a sounding referencesignal (SRS) may also be transmitted in the same slot.

When the terminal is scheduled to transmit the UL control channel, thereis a need for a method for transmitting the UL control channel when thenumber of UL OFDM symbols changes according to the slot format. There isalso a need for a method for preventing transmission resources of the ULcontrol channel from colliding with each other while maximizingutilization of time-frequency resources of the base station. To enablethe base station and the terminal to transmit and receive the UL controlchannel in a slot or mini-slot, the disclosure provides a method andapparatus that indicate an interval of the UL control channel (or startsymbol and end symbol) to the terminal and enable the terminal totransmit the UL control channel in the slot or mini-slot.

FIG. 3A is a diagram of a communication system, in accordance with anembodiment.

A base station 300 of the network operates a 5G cell 310. A terminal 320is a 5G capable terminal having a 5G transceiver module. The terminal320 acquires synchronization through a synchronization signaltransmitted from the 5G cell 310, receives system information, andtransmits and receives data to and from the base station 300 through the5G cell 310; there is no limitation on a duplex mode of the 5G cell 310.The UL control transmission is performed through the 5G cell 310 whenthe 5G cell 310 is a P cell. The system of FIG. 3A may have a pluralityof serving cells and may support a total of 32 serving cells. The basestation 300 can have a 5G transceiver module (or system), and the basestation 300 can manage the 5G system in real time.

FIGS. 3B and 3C are flowcharts of a method of transmitting and receivingdata between the base station 300 and the terminal 320 in a 5Gcommunication system, in accordance with an embodiment.

In FIG. 3B, the base station 300 configures 5G resources and exchangesdata with the 5G capable terminal 320 via the resources for the 5Gsystem.

At step 340, the base station 300 transmits synchronization and systeminformation for the 5G system and higher-layer configuration informationto the terminal 320. For the 5G system synchronization signal, separatesynchronization signals may be transmitted for eMBB, mMTC, and URLLCusing different numerologies, or a common synchronization signal may betransmitted via a specific 5G resource by using one numerology. Forsystem information, a common system signal can be transmitted via aparticular 5G resource by using one numerology, or separate pieces ofsystem information can be transmitted for eMBB, mMTC and URLLC usingdifferent numerologies. The system information and higher-layerconfiguration information may include configuration information relatingto a slot or a mini-slot, which may be used for data transmission andreception, a number of OFDM symbols in a slot or mini-slot, and thenumerology. Additionally, when a DL common control channel is set forthe terminal 320, the system information and higher-layer configurationinformation may include configuration information related to receptionof the DL common control channel.

At step 350, the base station 300 transmits and receives data for the 5Gservice to and from the terminal 320 via the 5G resource.

In FIG. 3C the terminal 320 receives 5G resource configurationinformation from the base station 300 and transmits and receives datavia the 5G resource.

At step 360, the terminal 20 acquires synchronization based on thesynchronization signal for the 5G system transmitted by the base station300 and receives system information and higher-layer configurationinformation from the base station 300. For the 5G system synchronizationsignal, separate synchronization signals may be transmitted for eMBB,mMTC, and URLLC using different numerologies, or a commonsynchronization signal may be transmitted via a specific 5G resource byusing one numerology. For system information, a common system signal canbe transmitted via a particular 5G resource by using one numerology, orseparate pieces of system information can be transmitted for eMBB, mMTCand URLLC using different numerologies. The system information andhigher-layer configuration information may include configurationinformation relating to a slot or a mini-slot, which may be used fordata transmission and reception, a number of OFDM symbols in a slot ormini-slot, and the numerology. Additionally, when a DL common controlchannel is set for the terminal, the system information and higher-layerconfiguration information may include configuration information relatedto reception of the DL common control channel.

At step 370, the terminal 320 transmits and receives data for the 5Gservice to and from the base station 300 via the 5G resource.

A description is given of a long PUCCH transmission method capable ofpreventing resource collision and maximizing resource utilization whenthe UL control channels such as long PUCCH, short PUCCH, and SRS coexistin one TTI or one slot in a situation where the 5G system of FIG. 3operates based on a slot or a mini-slot. This method is based on ascheme for indicating the transmission interval (or start symbol and endsymbol) of the long PUCCH.

FIGS. 4A and 4B are diagrams of slot configurations, in accordance withan embodiment.

In FIGS. 4A and 4B, a description is given of a scheme that enables aterminal to determine the transmission interval (or start symbol and endsymbol) of the long PUCCH based on a slot and to transmit the UL controlchannel. However, this scheme may also be applicable to the case wherethe terminal determines the transmission interval (or start symbol andend symbol) of the long PUCCH based on a mini-slot and transmits the ULcontrol channel.

In FIG. 4A, the long PUCCH and the short PUCCH are multiplexed in thefrequency domain (FDM) as indicated by 400 or multiplexed in the timedomain (TDM) as indicated by 401. A description is given of a slotstructure in which the long PUCCH and the short PUCCH are multiplexed420 or 421 indicate a slot, which is a basic unit for transmission inthe 5G system (also referred to as a subframe or a TTI, and the basicunit for transmission is assumed to be a slot as previously describedherein), i.e., an UL centric slot whose symbols are mainly UL symbols.All or most of the OFDM symbols of the UL centric slot are used for theUL. Several initial or final OFDM symbols of the UL centric slot may beused for the UL. If both DL symbols and UL symbols are present in oneslot, a transmission gap may exist between the DL symbols and the ULsymbols. In the UL centric slot 420 or 421, the first OFDM symbol isused for DL transmission (e.g., DL control channel transmission 402),the second OFDM symbol is used as a transmission gap, and the third andsubsequent OFDM symbols are used for UL transmission. For ULtransmission, UL data channel transmission and UL control channeltransmission are possible.

Next, a description is given of the long PUCCH 403. Since the controlchannel of a long transmission period is used to extend the cellcoverage, it can be transmitted via Discrete FourierTransform-spread-OFDM (DFT-S-OFDM) being a single carrier transmissionscheme rather than OFDM transmission. Hence, the long PUCCH should betransmitted using only consecutive subcarriers. In addition, to obtain afrequency diversity effect, UL control channels of a long transmissionperiod may be configured at some distance apart as indicated by 408 and409.

In the frequency domain, a distance 405 between the resourcesconstituting the long PUCCH can be smaller than the bandwidth supportedby the terminal. The long PUCCH in the front part of the slot may betransmitted by using PRB-1 as indicated by 408, and the long PUCCH inthe rear part of the slot may be transmitted by using PRB-2 as indicatedby 409. The PRB 404 is a minimum transmission unit in the frequencydomain, and can be defined by 12 subcarriers or the like. The frequencydomain distance between PRB-1 and PRB-2 can be smaller than the maximumsupported bandwidth of a terminal, and the maximum supported bandwidthof the terminal may be less than or equal to the bandwidth (406)supported by the system.

The frequency resources PRB-1 and PRB-2 may be configured for theterminal via a higher-layer signal. Each frequency resource may bemapped to a bit field via a higher-layer signal, and the bit fieldincluded in the DL control channel may indicate the frequency resourceto be used to the terminal. The control channel transmitted in the frontpart of the slot 408 and the control channel transmitted in the rearpart of the slot 409 are composed of UL control information (UCI) 410and a terminal-specific reference signal 411. It is assumed that thesetwo signals are separated in time and transmitted via different OFDMsymbols.

A description is given of the short PUCCH 418. The short PUCCH can betransmitted via both the DL centric slot and the UL centric slot. Theshort PUCCH is typically transmitted by the last symbol of the slot, orby an OFDM symbol in the rear part (e.g., last OFDM symbol, last but oneOFDM symbol, or last two OFDM symbols). It is also possible that theshort PUCCH is transmitted at an arbitrary position in the slot. Theshort PUCCH may be transmitted by using one or more OFDM symbols.

In FIG. 4A, the short PUCCH is transmitted by the last symbol 418 of theslot. The radio resources for the short PUCCH are allocated in units ofPRBs in the frequency domain. For the short PUCCH, a plurality ofconsecutive PRBs may be allocated, or a plurality of PRBs spaced apartin the frequency band may be allocated. The allocated PRB should beincluded in a frequency band narrower than or equal to the bandwidth 407supported by the terminal. The multiple PRBs as frequency resources maybe configured for the terminal via a higher-layer signal. Each frequencyresource may be mapped to a bit field via a higher-layer signal, and thebit field included in the DL control channel may indicate the frequencyresource to be used to the terminal.

Within one PRB, the UL control information 425 and demodulationreference signal 426 should be multiplexed in the frequency band. Thedemodulation reference signal may be transmitted on one subcarrier perevery two symbols as indicated by 412, transmitted on one subcarrier perevery three symbols as indicated by 413, or transmitted on onesubcarrier per every four symbols as indicated by 413. The scheme fordemodulation signal transmission as indicated by 412, 413, or 414 may beconfigured by a higher-layer signal. The terminal may multiplex thedemodulation reference signal and the UL control information andtransmit the multiplexed signal according to the scheme indicated by thereceived higher-layer signal.

Alternatively, the scheme for transmitting the demodulation referencesignal may be determined according to the number of bits of the ULcontrol information 425. For example, if the number of bits of the ULcontrol information is small, the terminal can transmit the UL controlinformation and the demodulation reference signal via the short PUCCH bymultiplexing the demodulation reference signal and the UL controlinformation in a manner indicated by 412. When the number of bits of theUL control information is small, a sufficient transmission code rate canbe obtained without using a large amount of resources for transmissionof UL control information. For example, if the number of bits of the ULcontrol information is large, the terminal can transmit the UL controlinformation and the demodulation reference signal by multiplexing thedemodulation reference signal and the UL control information in a mannerindicated by 414. When the number of bits of the UL control informationis large, it is necessary to use a large amount of resources fortransmission of the UL control information in order to lower thetransmission code rate.

A description is given of an example for multiplexing the long PUCCH andthe short PUCCH. A long PUCCH and a short PUCCH of different terminalsmay be multiplexed in the frequency domain within one slot 420 asindicated by 400. Here, the base station may configure the frequencyresources for the short PUCCH and the long PUCCH of different terminalsso that they do not overlap as in the case of PRBs in FIG. 4. However,configuring different transmission resources in the frequency domain forUL control channels of different terminals regardless of scheduling is awaste of frequency and is not appropriate considering that limitedfrequency resources should be used for UL data channel transmissionrather than UL control channel transmission.

Hence, short PUCCH and long PUCCH frequency resources of differentterminals may overlap, and the base station should ensure that differentterminals do not experience a scheduling conflict or transmissionresource collision in one slot. When a collision between short PUCCHtransmission resources and long PUCCH transmission resources ofdifferent terminals cannot be avoided in a specific slot, the basestation needs a mechanism to prevent such a collision and the terminalneeds to adjust the long PUCCH transmission resources according to thedirection of the base station. As such, the long PUCCH transmissionresource and the short PUCCH transmission resource may be multiplexed inthe frequency domain within one slot 421 as indicated by 401.

FIG. 4B shows an example in which the number of UL OFDM symbols for longPUCCH transmission may be different for each slot. A description isgiven of a case where the number of UL OFDM symbols for long PUCCHtransmission is different from slot to slot with reference to FIG. 4B.The slot format of a specific slot may be determined by the base stationand may be indicated to the terminal via the DL control channel. Hence,the slot format may be transmitted in each slot as indicated by 450. Forexample, slot #n (460) has 14 UL OFDM symbols; slot #(n+1)(470) has 12UL OFDM symbols; although slot #(n+2)(480) has 11 UL OFDM symbols, asthe last UL OFDM symbol is used for SRS transmission 482, 10 UL OFDMsymbols can actually be used for long PUCCH transmission; and althoughslot #(n+3)(490) has 11 UL OFDM symbols, as the last two UL OFDM symbolsare used for short PUCCH transmission 492, 9 UL OFDM symbols canactually be used for long PUCCH transmission. As described above, thenumber of UL OFDM symbols available to long PUCCH transmission in eachslot may vary depending on the number of UL OFDM symbols given in theslot format and transmission of other UL control channels such as shortPUCCH and SRS.

The disclosure provides methods for long PUCCH transmission withoutregard to the number of UL OFDM symbols in one slot that variesdepending upon the number of UL OFDM symbols given by the slot format ortransmission of UL control channels in a short duration such as shortPUCCH or SRS.

In a first method, the base station directly indicates the long PUCCHtransmission resource in one slot via a first signal to the terminal.The terminal performs long PUCCH transmission via the transmissionresource indicated in one slot by the received first signal, or theterminal performs long PUCCH transmission via the transmission resourceimplicitly (or indirectly) indicated by a specified rule associating thelong PUCCH transmission resource with the number of UL OFDM symbols, thenumber of DL OFDM symbols, and the number of GP OFDM symbols in theslot. The first signal may be a higher-layer signal or a physical-layersignal. The first signal includes information for long PUCCHtransmission indicating an OFDM symbol interval (or, start OFDM symboland end OFDM symbol) in the time domain and a PRB in the frequencydomain.

If long PUCCH transmission with an OFDM symbol interval set implicitlyor by the first signal is not possible owing to reception of a thirdsignal indicating that SRS or short PUCCH transmission of anotherterminal is transmitted at a specific OFDM symbol of the slot, theterminal may discard the long PUCCH transmission. Alternatively, theterminal determines the number of overlapping OFDM symbols between theOFDM symbols for long PUCCH transmission and the OFDM symbols for SRS orshort PUCCH transmission. If the number of overlapping OFDM symbols isless than a preset threshold, the terminal may perform long PUCCHtransmission after puncturing the overlapping OFDM symbols. Otherwise,the terminal may discard the long PUCCH transmission. Alternatively, theterminal may also perform long PUCCH transmission after puncturing thoseOFDM symbols overlapping the OFDM symbols for SRS or short PUCCHtransmission. The third signal and the threshold may be configured by ahigher-layer signal, and the threshold may be a constant indicating aspecific number of OFDM symbols.

In a second method, the base station indicates the transmission resourcefor the long PUCCH in one slot directly to the terminal through a firstsignal and a second signal. The terminal performs long PUCCHtransmission on the transmission resource in one slot indicated by thereceived first signal and second signal. Here, the first signal may be ahigher-layer signal, and the second signal may be a physical-layersignal. The first signal may indicate a set of OFDM symbol intervals (orstart OFDM symbol and end OFDM symbol) in the time domain and PRBs inthe frequency domain being available for long PUCCH transmission, andthe second signal may indicate a selected entry of the set.

In a third method, the base station directly or indirectly indicates thelong PUCCH transmission resource in one slot in advance through a firstsignal or a specified rule associating the long PUCCH transmissionresource with the number of UL OFDM symbols, the number of DL OFDMsymbols, and the number of GP OFDM symbols in the slot to the terminal,and reduces or adjusts the previously indicated long PUCCH transmissionresource in one slot through a second signal to avoid a collision withthe UL control channel transmission resource of a short time period. Theterminal determines in advance the transmission interval of the longPUCCH based on the received first signal or the number of UL, DL and GPOFDM symbols in the slot, and performs long PUCCH transmission in oneslot while adjusting the long PUCCH transmission resource in one slotbased on the received second signal. The first signal and the secondsignal may be a higher-layer signal, a physical-layer signal, or acombination thereof. The first signal may indicate an OFDM symbolinterval (or start OFDM symbol and end OFDM symbol) in the time domainand a PRB in the frequency domain available for long PUCCH transmission,and the second signal may indicate an OFDM symbol interval (or startOFDM symbol and end OFDM symbol) in the time domain and a PRB in thefrequency domain unavailable for long PUCCH transmission in one slot.

The first method is suitable for UL control channel transmissionconfigured for the terminal to perform periodic channel informationtransmission without a scheduling grant. The second and third methodsare suitable for UL control channel transmission configured for theterminal to perform aperiodic HARQ-ACK transmission according to ascheduling grant. Hence, the first method, and the second or thirdmethod may be applied depending on whether the UL control channel to betransmitted by the terminal is triggered by the scheduling grant, andwhether the UL control information to be transmitted is periodic channelinformation or HARQ-ACK. That is, the terminal may apply the firstmethod to the transmission of the UL control channel configured to betransmitted without a scheduling grant. The terminal may apply thesecond or third method to the transmission of the UL control channelwhose transmission is triggered by the scheduling grant. Alternatively,the terminal may apply the first method to the transmission of the ULcontrol channel carrying periodic channel information, and the terminalmay apply the second or third method to the transmission of the ULcontrol channel carrying HARQ-ACK information.

The terminal may also be configured to determine whether to apply thefirst method, the second method, or the third method through ahigher-layer signal. Upon receiving a higher-layer signal as a settingsignal for applying the first method, the terminal may always transmitthe UL control channel by applying the first method.

Upon receiving a higher-layer signal as a setting signal for applyingthe second method, the terminal may always transmit the UL controlchannel by applying the second method. Upon receiving a higher-layersignal as a setting signal for applying the third method, the terminalmay always transmit the UL control channel by applying the third method.

Next, a description is given of detailed examples for the first, secondand third methods. The examples described below are not mapped insequence with the methods described above. For instance, the secondexample may be related to the first method.

In a first example, the DL control channel is used to indicate an OFDMsymbol interval for long PUCCH transmission (or, start and end OFDMsymbols, or OFDM symbols unavailable to long PUCCH transmission) to theterminal. The DL control channel may be common information for allterminals in a group or a cell, or may be dedicated information destinedfor a specific terminal. For instance, when the frequency resource forlong PUCCH transmission of the terminal collides with the frequencyresource for short PUCCH transmission of another terminal at the lastOFDM symbol of the slot, the base station can prevent the long PUCCHtransmission interval from including the last OFDM symbol of the slot.When the long PUCCH transmission interval is supported by four to twelveOFDM symbols (e.g., the UL interval of the UL centric slot 420 in FIG.4A includes 12 OFDM symbols), the base station may indicate long PUCCHtransmission using 11 OFDM symbols instead of using 12 OFDM symbols viaa bit field of the DL control channel, and the terminal may transmit thelong PUCCH using 11 OFDM symbols.

When the long PUCCH transmission interval is set as a set of limitedOFDM symbols through a higher-layer signal or a specification rule(e.g., a higher-layer signal or a specification rule indicates that thelong PUCCH transmission interval is available only for 4, 6, 8, 10, 12OFDM symbols), to avoid a collision with the short PUCCH transmissionresource at the last OFDM symbol, the base station may indicate that thelong PUCCH transmission is possible for 10 OFDM symbols through a bitfield of the DL control channel, and the terminal may perform long PUCCHtransmission using 10 OFDM symbols.

Alternatively, the base station may avoid a resource conflict with thelong PUCCH by indicating the short PUCCH transmission interval (e.g.,indicating whether the short PUCCH transmission interval includes thelast OFDM symbol, the last but one OFDM symbol, or the last two OFDMsymbols in the slot) to the terminal.

In a second example, a higher-layer signal is used to indicate an OFDMsymbol interval for long PUCCH transmission (or, start and end OFDMsymbols, or OFDM symbols unavailable to long PUCCH transmission) to theterminal. The frequency resources for short PUCCH transmission may beconfigured as distributed PRBs or as localized PRBs. When the frequencyresources for short PUCCH transmission are configured as distributedPRBs, there is a high probability of a collision with the long PUCCHtransmission resource. Hence, the base station may configure the OFDMsymbol interval for long PUCCH transmission so that it does not includethe OFDM symbols used for short PUCCH transmission (e.g., the last OFDMsymbol) via a higher-layer signal. For instance, the base station mayindicate that the long PUCCH transmission is possible for 10 OFDMsymbols through a higher-layer to the terminal, and the terminal mayperform long PUCCH transmission using 10 OFDM symbols.

In a third example, a higher-layer signal or physical DL control signalis configured for the terminal to determine whether to perform longPUCCH transmission or short PUCCH transmission, and the OFDM symbolinterval for long PUCCH transmission is associated with the number of ULOFDM symbols indicated by the slot format. The base station indicatesinformation on whether the last 1 or 2 OFDM symbols are available tolong PUCCH transmission to the terminal. The terminal may determinewhether to transmit a long PUCCH or a short PUCCH based on the receivedconfiguration information. Upon determining to perform long PUCCHtransmission, the terminal may determine whether the last 1 or 2 OFDMsymbols are also usable for the long PUCCH transmission based on thereceived indication information. For instance, assuming that the UL OFDMsymbol interval of the slot includes 11 OFDM symbols, the terminal maydetermine that that 11 OFDM symbols are available to long PUCCHtransmission based on the UL OFDM symbol interval of the slot, and maydetermine whether to perform long PUCCH transmission via 11 OFDMsymbols, 10 OFDM symbols, or 9 OFDM symbols based on the receivedindication information. To perform long PUCCH transmission via 10 OFDMsymbols or 9 OFDM symbols, the long PUCCH symbols may be punctured fromthe end with respect to long PUCCH transmission via 11 OFDM symbols orbe rate-matched. The terminal may receive information on the UL OFDMsymbol interval of the slot via the DL control channel. The DL controlchannel may be common information for all terminals in a group or acell, or may be dedicated information destined for a specific terminal.

FIGS. 5A and 5B are flowcharts of a method of transmitting and receivingdata between a base station and a terminal in a 5G communication system,in accordance with an embodiment.

In FIG. 5A, at step 500, a base station transmits UL control channelconfiguration information to a terminal. As described above inconnection with FIGS. 4A and 4B, the UL control channel configurationinformation may indicate a set of OFDM symbol intervals in the timedomain and PRBs in the frequency domain available for long or shortPUCCH transmission, and may be transmitted to the terminal via ahigher-layer signal so as to avoid a collision between short PUCCHtransmission resources and long PUCCH transmission resources ofdifferent terminals.

At step 510, the base station transmits a DL control channel to theterminal. As described above in connection with FIGS. 4A and 4B, the DLcontrol channel may include a bit field that indicates an OFDM symbolinterval (or start OFDM symbol and end OFDM symbol) in the time domainand a PRB in the frequency domain available to the short PUCCH or thelong PUCCH and OFDM symbols unavailable to the long PUCCH transmission,and may be transmitted to the terminal so as to avoid a collisionbetween short PUCCH transmission resources and long PUCCH transmissionresources of different terminals. The DL control channel may be commoninformation for all terminals in a group or a cell, or may be dedicatedinformation destined for a specific terminal.

At step 520, the base station receives the UL control channel from theterminal according to the short PUCCH or long PUCCH transmission timeand frequency resource indicated at steps 500 or 510. Some of the stepsof FIG. 5A may be skipped. For example, the base station may transmitthe UL control channel configuration information to the terminal throughthe DL control channel at step 510, and receive the UL control channelfrom the terminal at step 520.

In FIG. 5B, at step 550, the terminal receives UL control channelconfiguration information from the base station. As described above inconnection with FIGS. 4A and 4B, the UL control channel configurationinformation may indicate a set of OFDM symbol intervals in the timedomain and PRBs in the frequency domain available for long or shortPUCCH transmission, and may be received from the base station via ahigher-layer signal so as to avoid a collision between short PUCCHtransmission resources and long PUCCH transmission resources ofdifferent terminals.

At step 560, the terminal receives a DL control channel from the basestation. As described above in connection with FIGS. 4A and 4B, the DLcontrol channel may include a bit field that indicates an OFDM symbolinterval (or start OFDM symbol and end OFDM symbol) in the time domainand a PRB in the frequency domain available to the short PUCCH or thelong PUCCH and OFDM symbols unavailable to the long PUCCH transmission,and may be received from the base station so as to avoid a collisionbetween short PUCCH transmission resources and long PUCCH transmissionresources of different terminals. The DL control channel may be commoninformation for all terminals in a group or a cell, or may be dedicatedinformation destined for a specific terminal.

At step 570, the terminal transmits the UL control channel to the basestation according to the short PUCCH or long PUCCH transmission time andfrequency resource indicated by the information received at steps 550 or560.

FIG. 6 is a diagram of a slot configuration, in accordance with anembodiment.

FIG. 6 shows an example in which the long PUCCH is transmitted in thetime-frequency domain. 620 indicates a slot, which is a basic unit fortransmission in the 5G system (a subframe or a TTI, and the basic unitfor transmission is assumed to be a slot in the description), i.e., anUL centric slot whose symbols are mainly UL symbols. All or most of theOFDM symbols of the UL centric slot are used for the UL. Several initialor final OFDM symbols of the UL centric slot may be used for the UL. Ifboth DL symbols and UL symbols are present in one slot, a transmissiongap may exist between the DL symbols and the UL symbols. In the slot ofFIG. 6, the first OFDM symbol is used for DL transmission (e.g., DLcontrol channel transmission 602), the second OFDM symbol is used as atransmission gap, and the third and subsequent OFDM symbols are used forUL transmission. For UL transmission, UL data channel transmission andUL control channel transmission are possible.

For the long PUCCH 603, since the control channel of a long transmissionperiod is used to extend the cell coverage, it can be transmitted viaDFT-S-OFDM being a single carrier transmission scheme rather than OFDMtransmission. Hence, the long PUCCH should be transmitted using onlyconsecutive subcarriers. In addition, to obtain a frequency diversityeffect, UL control channels of a long transmission period may beconfigured at some distance apart as indicated by 608 and 609. In thefrequency domain, the distance 605 between the resources constitutingthe long PUCCH should be smaller than the bandwidth supported by theterminal. The long PUCCH in the front part of the slot may betransmitted by using PRB-1 as indicated by 608, and the long PUCCH inthe rear part of the slot may be transmitted by using PRB-2 as indicatedby 609. The PRB 604 is a PRB, which is a minimum transmission unit inthe frequency domain, and can be defined by 12 subcarriers or the like.The frequency domain distance between PRB-1 and PRB-2 should be smallerthan the maximum supported bandwidth 605 of the terminal, and themaximum supported bandwidth 605 of the terminal may be less than orequal to the bandwidth (606) supported by the system.

The frequency resources PRB-1 and PRB-2 may be configured for theterminal via a higher-layer signal or physical-layer signal. Eachfrequency resources may be mapped to a bit field via a higher-layersignal, and the bit field included in the d DL control channel mayindicate the frequency resource to be used to the terminal. The controlchannel transmitted in the front part of the slot 608 and the controlchannel transmitted in the rear part of the slot 609 are composed of ULcontrol information (UCI) 610 and a terminal-specific reference signal611. It is assumed that these two signals are separated in time andtransmitted via different OFDM symbols.

In addition, the originally configured frequency resources 631 and 632may be increased according to the number of bits of the UL controlinformation. The amount of frequency resources increased in accordancewith the number of bits of the UL control information can be specifiedby the standard, and the terminal can determine the amount of frequencyresources for the UL control information according to the specifiedrule. Alternatively, the amount of frequency resources corresponding tothe UL control information can be configured via a higher-layer signal,and the terminal can determine the amount of frequency resources for theUL control channel on the basis of the received higher-layer signal andtransmit the UL control channel by use of the frequency resources. Theamount of frequency resources for transmission of the UL controlinformation may increase within the maximum supported bandwidth 605 ofthe terminal. For example, the originally configured frequency resources631 and 632 can be increased by 1 RB as indicated by 633 and 634,respectively, according to the amount of UL control information. If theamount of UL control information is further increased, the frequencyresources can be increased respectively by 2 RBs as indicated by 633,634, 635, and 636.

FIG. 7 is a diagram of a base station, in accordance with an embodiment.

A controller 710 of a base station (e.g., base station 300) controls ULcontrol channel transmission resources according to the base stationprocedure described in FIG. 5A, and UL control channel settings and themethod of configuring time domain and/or frequency domain transmissionresources for the UL control channel described in FIGS. 4A, 4B and 6.Under the control of the controller 710, a 5G resource informationtransmitter 750 transmits resource configuration information to aterminal by use of the 5G data transceiver 770. A scheduler 730schedules 5G data to exchange 5G data with the terminal through the 5Gdata transceiver 770.

FIG. 8 is a diagram of a terminal station, in accordance with anembodiment.

A terminal (e.g., terminal 320) may receive UL control channeltransmission resource configuration information from the base stationthrough a 5G resource information receiver 850 and a 5G data transceiver860 according to the terminal procedure described in FIG. 5B, and ULcontrol channel settings and the method of configuring time domainand/or frequency domain transmission resources for the UL controlchannel described in FIGS. 4A, 4B, and 6. The controller 810 mayexchange scheduled 5G data (may include UL control information) with the5G base station through the 5G data transceiver 860 at the resourcelocation indicated by the received resource configuration information.

In accordance with the disclosure, even when a number of UL OFDM symbolschanges according to the slot format, terminals can perform long PUCCHtransmission based on the indicated information. Moreover, even when ULcontrol channels such as long PUCCH, short PUCCH and SRS coexist in oneslot, a resource collision between terminals is significantly reduced,and when performing long PUCCH transmission, resource utilization of thebase station can be maximized.

While the disclosure has been shown and described with reference tocertain embodiments thereof, it will be understood by those skilled inthe art that various changes in form and details may be made thereinwithout departing from the scope of the disclosure. Therefore, the scopeof the disclosure should not be defined as being limited to theembodiments, but should be defined by the appended claims andequivalents thereof.

What is claimed is:
 1. A method of receiving uplink control informationin a communication system, the method comprising: identifying a resourcefor receiving the uplink control information on a first uplink controlchannel from a terminal; transmitting first information associated withthe resource to the terminal; transmitting second information associatedwith the resource to the terminal; and receiving the uplink controlinformation on the uplink control channel based on the first informationand the second information from the terminal.
 2. The method of claim 1,wherein the first information indicates the resource for the firstuplink control channel, the resource being included in a slot, andwherein the second information indicates a resource for at least one ofa sounding reference signal and a second uplink control channel in theslot.
 3. The method of claim 1, wherein the first information indicatesa plurality of resources for the first uplink control channel, andwherein the second information indicates one resource of the pluralityof resources for the first uplink control channel.
 4. The method ofclaim 1, wherein the first information indicates the resource for thefirst uplink control channel, and wherein the second informationindicates a resource that has been changed in a slot for the firstuplink control channel.
 5. A method of transmitting uplink controlinformation in a communication system, the method comprising: receiving,from a base station, first information associated with a resource fortransmitting the uplink control information on a first uplink controlchannel to the base station; receiving, from the base station, secondinformation associated with the resource; identifying the resource forthe first uplink control channel based on the first information and thesecond information; and transmitting, to the base station, the uplinkcontrol information on the first uplink control channel on theidentified resource.
 6. The method of claim 5, wherein the firstinformation indicates the resource for the first uplink control channel,the resource being included in a slot, and wherein the secondinformation indicates a resource for at least one of a soundingreference signal and a second uplink control channel in the slot.
 7. Themethod of claim 5, wherein the first information indicates a pluralityof resources for the first uplink control channel, and wherein thesecond information indicates one resource of the plurality of resourcesfor the first uplink control channel.
 8. The method of claim 5, whereinthe first information indicates the resource for the first uplinkcontrol channel, and wherein the second information indicates a resourcethat has been changed in a slot for the first uplink control channel. 9.A base station for receiving uplink control information in acommunication system, the base station comprising: a transceiver; and aprocessor coupled with the transceiver and configured to: identify aresource for receiving the uplink control information on a first uplinkcontrol channel from a terminal, transmit first information associatedwith the resource to the terminal, transmit second informationassociated with the resource to the terminal, and receive the uplinkcontrol information on the uplink control channel based on the firstinformation and the second information from the terminal.
 10. The basestation of claim 9, wherein the first information indicates the resourcefor the first uplink control channel, the resource being included in aslot, and wherein the second information indicates a resource for atleast one of a sounding reference signal and a second uplink controlchannel in the slot.
 11. The base station of claim 9, wherein the firstinformation indicates a plurality of resources for the first uplinkcontrol channel, and wherein the second information indicates oneresource of the plurality of resources for the first uplink controlchannel.
 12. A terminal for transmitting uplink control information in acommunication system, the terminal comprising: a transceiver; and aprocessor coupled with the transceiver and configured to: receive, froma base station, first information associated with a resource fortransmitting the uplink control information on a first uplink controlchannel to the base station; receive, from the base station, secondinformation associated with the resource; identify the resource for thefirst uplink control channel based on the first information and thesecond information; and transmit, to the base station, the uplinkcontrol information on the first uplink control channel on theidentified resource.
 13. The terminal of claim 12, wherein the firstinformation indicates the resource for the first uplink control channel,the resource being included in a slot, and wherein the secondinformation indicates a resource for at least one of a soundingreference signal and a second uplink control channel in the slot. 14.The terminal of claim 12, wherein the first information indicates aplurality of resources for the first uplink control channel, and whereinthe second information indicates one resource of the plurality ofresources for the first uplink control channel.
 15. The terminal ofclaim 12, wherein the first information indicates the resource for thefirst uplink control channel, and wherein the second informationindicates a resources that has been changed in a slot for the firstuplink control channel.